LI‑7500RS Frequently Asked Questions

Q What is the power consumption for the LI‑7500RS?

A The LI‑7500RS can be powered using any 10.5 to 30 VDC power supply, such as a 12 volt deep-cycle marine battery. During normal operation the analyzer uses 12 Watts of power. With the ability to be powered by a solar power supply, the LI‑7500RS is ideal for use in remote locations with limited electrical power.

Q Is an upgrade available from the current LI‑7500A to the LI‑7500RS?

A Yes! You can get a factory upgrade that includes replacement hardware, software, and a recalibration. The upgrade cannot be installed in the field

Q Is an upgrade available from the current LI‑7500 to the LI‑7500RS?

A Due to the complexity and number of components involved, this would cost more than a new LI‑7500RS. Therefore, we recommend that you keep your old LI‑7500 for other experiments and get a new LI‑7500RS. You can still upgrade an original LI‑7500 to the LI‑7500A. This provides the advanced capabilities of the LI‑7500RS, but does not include the upgraded optics.

Q What kind of data logger is necessary for measurements?

A You don’t need an external data logger to record data from the LI‑7500RS. The LI-7550 collects synchronized CO2/H2O densities, sonic anemometer measurements, and supporting ancillary data from a LI-COR Biomet System on a removable 16 GB USB device.

Q How much data can be stored in the LI‑7550 Analyzer Interface Unit?

A The instrument includes one 16 GB industrial grade USB drive, which can store up to 80 days of 10 Hz data when logging the full complement of variables. When logging the minimum data set of 10 variables, data could be logged for about 200 days with the 16 GB flash drive.

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Q Since the LI‑7500A has integrated data logging, can I connect a sonic anemometer to it?

A Yes! There are four analog inputs on the LI‑7550 Analyzer Interface Unit allowing wind speed in three dimensions and sonic temperature to be recorded with CO2 and H2O data.

Q What is the difference between the LI‑7500A and the LI‑7500RS?

A The LI‑7500RS has improved optical components that help the instrument maintain accurate measurements, even as dirt accumulates on the optics. This, combined with improved temperature control algorithms, helps the instrument perform well even when it is not cleaned regularly. The included SMARTFlux System now provides fully processed eddy covariance results in real time.

Q What’s the difference between the original LI‑7500 and the LI‑7500RS?

A The LI‑7500RS has a low chopper housing temperature setting for use in cold climates. This saves energy and essentially eliminates the impact of surface heating on CO2 flux measurements. The LI‑7550 Analyzer Interface Unit has high-speed analog inputs for a sonic anemometer, onboard USB data logging of complete eddy covariance data sets, and the SMARTFlux System, which computes results in real time on EddyPro Software. Ethernet connectivity makes it possible to connect a cellular modem and access the instrument online.

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